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Re: Conversion Error? [message #16813 is a reply to message #16680]

Tue, 17 August 1999 00:00

steinhh
Messages: 260
Registered: June 1994

Senior Member

In article <4KVt3.65216$jl.41071979@newscontent-01.sprint.ca>
"Laurent Chardon" <chardons@NOT_THISsprint.ca> writes:

> Thanks David and Martin for your help. So if I understand
> properly, IDL uses fix() by default when converting doubles to
> integer. That's tricky. Does it make sense to do that?

Yes, it does. I know of no other language that rounds by default
when converting float to integer types. (Ok, so there probably
are *some* languages that use round).

> The solution would be to use c=fltarr(round(size)). Shouldn't IDL
> do that by default?
> I'm wondering what's the use of using fix() instead of round() in
> this instance. Does anybod know?

You can bet a number of applications *rely* on this default
behaviour. Needs differ from one situation to another. You should
also consider using either ceil() or floor() instead of round(),
in some cases.

Regards,

Stein Vidar

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[Message index]

		Conversion Error? By: Laurent Chardon on Mon, 16 August 1999 00:00
		Re: Conversion Error? By: m218003 on Tue, 17 August 1999 00:00
		Re: Conversion Error? By: steinhh on Tue, 17 August 1999 00:00
		Re: Conversion Error? By: Med Bennett on Mon, 16 August 1999 00:00
		Re: Conversion Error? By: davidf on Mon, 16 August 1999 00:00
		Re: Conversion Error? By: Laurent Chardon on Mon, 16 August 1999 00:00
		Re: Conversion Error? By: m218003 on Mon, 16 August 1999 00:00

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